I am cool without the 12,
I am 688,
in fact, I'm ageless,
I existed when dinosaurs breathed.
If you're stuck,
close your eyes and take a deep breath.
There goes your answer,
gone without being seen.
You are:
Carbon dioxide (CO2)
i am cool without the 12
COOL - L (12th letter) = COO = CO2
i am 688
Atomic numbers: 6=C, 8=O giving COO again
in fact i'm ageless,
I exists when dinosaur breaths.
Carbon dioxide has been exhaled by creatures into the atmosphere since the age of dinosaurs
take a deep breath.
There's goes your answer,
gone without being seen.
It's invisible when you breathe out.
fizzzzzz!
The fizz in soft drinks is carbon dioxide